US4313122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Open cavity radiating source excited by a dipole
Assignee: Thales SA
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Filing: 1980-01-29
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Granted: 1982-01-26
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Expires: 2000-01-29
Abstract
Abstract A microwave radiator comprises a generally cup-shaped, at least partly metallic cavity with a cylindrical wall and an open end which is bounded by an edge or rim with two diametrically opposite axial projections, in the form of acute-angled cusps or rectangular teeth, which are bisected by an axial plane perpendicular to a dipole disposed inside the cavity. The open cavity end may be covered by a dielectric radome of frustoconical or stepped cylindrical configuration.
Inventors
- 👤 Albert Dupressoir
- 👤 Claude Bloch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:51
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/06; H01Q9/065; H01Q1/00; H01Q1/42; H01Q13/00; H01Q13/10; H01Q13/18
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
52 words
A microwave radiator comprising: a generally cup-shaped cavity with a cylindrical peripheral metal wall centered on an axis and an open end bounded by an edge with two diametrically opposite axial projections; and a diametrically extending dipole in said cavity, said projections being bisected by an axial plane perpendicular to said dipole.
Claim 2
Dependent Claim
52 words
A microwave radiator comprising: a generally cup-shaped cavity with a cylindrical peripheral metal wall centered on an axis and an open end bounded by an edge with two diametrically opposite axial projections; and a diametrically extending dipole in said cavity, said projections being bisected by an axial plane perpendicular to said dipole.
Claim 3
Dependent Claim
38 words
A radiator as defined in claim 1 wherein said edge lies in two intersecting oblique planes of a dihedral which are symmetrical about said axial plane, said projections being cusps defined by the intersection of said oblique planes.
Claim 4
Dependent Claim
18 words
A radiator as defined in claim 2 wherein said oblique planes include an acute angle with each other.
Claim 5
Dependent Claim
22 words
A radiator as defined in claim 2 or 3 wherein said cusps have a height of substantially one-fifth of the operating wavelength.
Claim 6
Dependent Claim
16 words
A radiator as defined in claim 1 wherein said projections are teeth of generally rectangular shape.
Claim 7
Dependent Claim
28 words
A radiator as defined in claim 5 wherein said teeth have a width of substantially half the operating wavelength and a height of substantially one-tenth of said wavelength.
Claim 8
Dependent Claim
30 words
A radiator as defined in claim 1 or 2 wherein said cavity is covered by a dielectric radome rising from said open end with progressively decreasing diameter and wall thickness.
Claim 9
Dependent Claim
14 words
A radiator as defined in claim 7 wherein said radome is of frustoconical shape.
Claim 10
Dependent Claim
15 words
A radiator as defined in claim 7 wherein said radome is of stepped cylindrical shape.
Claim 11
Dependent Claim
36 words
A radiator as defined in claim 7 wherein said cavity has a dielectric base, said peripheral wall being a metallic layer overlying said base and surrounding an adjoining part of said radome interfitted with said base.
Claim 12
Dependent Claim
28 words
A radiator as defined in claim 1 or 2 wherein said peripheral wall is metallic and is internally provided with a dielectric reinforcing ring spaced from said edge.
Claim 13
Dependent Claim
14 words
A radiator as defined in claim 1 wherein said dipole is of quarter wavelength.
Claim 14
Dependent Claim
27 words
An antenna comprising a plurality of radiators as defined in claim 1 or 2 disposed in a circularly symmetrical array with their dipoles parallel to one another.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |